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Sema: fix function paramater count mismatch note

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expected type 'fn() void', found 'fn(i32) void'
function with 0 parameters cannot cast into a function with 0 parameters
  =>
expected type 'fn() void', found 'fn(i32) void'
function with 1 parameters cannot cast into a function with 0 parameters
This commit is contained in:
Jacob Young 2022-10-01 11:38:33 -04:00 committed by Veikka Tuominen
parent db5562deb0
commit 9d8cdb855b
2 changed files with 22 additions and 1 deletions
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2
src/Sema.zig
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@ -24312,7 +24312,7 @@ fn coerceInMemoryAllowedFns(
if (dest_info.param_types.len != src_info.param_types.len) {
return InMemoryCoercionResult{ .fn_param_count = .{
.actual = dest_info.param_types.len,
.actual = src_info.param_types.len,
.wanted = dest_info.param_types.len,
} };
}

21
test/cases/compile_errors/function_type_coercion.zig Normal file
View File

@ -0,0 +1,21 @@
fn f(_: i32) void {}
export fn wrong_param_count() void {
_ = @as(fn () void, f);
}
export fn wrong_param_type() void {
_ = @as(fn (f32) void, f);
}
export fn wrong_return_type() void {
_ = @as(fn () i32, f);
}
// error
// backend=stage2,llvm
// target=native
//
// :3:25: error: expected type 'fn() void', found 'fn(i32) void'
// :3:25: note: function with 1 parameters cannot cast into a function with 0 parameters
// :6:28: error: expected type 'fn(f32) void', found 'fn(i32) void'
// :6:28: note: parameter 0 'i32' cannot cast into 'f32'
// :9:24: error: expected type 'fn() i32', found 'fn(i32) void'
// :9:24: note: return type 'void' cannot cast into return type 'i32'